Demi Lovato turned 26 on Monday (Aug. 20), and her friends are taking to Twitter to share their undying support and love for the songstress as she recovers from her reported overdose in July.

Quincy Jones sent Lovato a particularly poignant message, writing, "Having spent 85 years on this planet, I've learned this life is full of hills/valleys but it's the moments after I've been stuck in my deepest valleys that I've been able to conquer my deepest fears/battles.Today we celebrate U, keep shinin bright!"

Happy Bday to U sweet @ddlovato.Having spent 85 years on this planet, I've learned this life is full of hills/valleys but it's the moments after I've been stuck in my deepest valleys that I've been able to conquer my deepest fears/battles.Today we celebrate U, keep shinin bright! pic.twitter.com/jxFdfsVUNv